Intrinsic electrical and thermal properties from single crystals of Na24Si136

The observation of intrinsic structural, electrical, and thermal properties from measurements on single-crystal specimens of clathrate-II Na24Si136 is reported, revealing metallic conduction in agreement with electronic structure calculations. Low-temperature heat capacity measurements corroborate a...

Full description

Saved in:
Bibliographic Details
Published in:Physical review letters 2010-01, Vol.104 (1), p.018301-018301
Main Authors: Beekman, M, Schnelle, W, Borrmann, H, Baitinger, M, Grin, Yu, Nolas, G S
Format: Article
Language:English
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The observation of intrinsic structural, electrical, and thermal properties from measurements on single-crystal specimens of clathrate-II Na24Si136 is reported, revealing metallic conduction in agreement with electronic structure calculations. Low-temperature heat capacity measurements corroborate a substantial electronic density of states at the Fermi level, and reveal an Einstein-like mode that can be attributed to Na guest "rattling". The large thermal conductivity of Na24Si136, compared to literature data for other intermetallic clathrates, can be understood in terms of the predominant electronic contribution for the fully filled Na24Si136 composition.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.104.018301